The muscles in your forearm move the wrist around. Some of the forearm muscles are responsible for opening and closing the hand. Most people when lifting in the gym don’t pay attention to their forearms. That’s a mistake. Some people do, every once in a while I’ll see someone doing a wrist flexion or extension exercise but not often. After a stroke, most often you’re gonna pay a lot of attention to these muscles. Here are some exercises. And this. And this. I used to love to give out this exercise, people thought it was so weird. This picture uses sand but I always used rice.